package com.example.day3.exercise;

import java.util.List;
import java.util.stream.Stream;

import static java.util.stream.Collectors.groupingBy;
import static java.util.stream.Collectors.summingInt;

/**
 * 自定义Collector求平均
 */
public class Exercise9 {
    public static void main(String[] args) {

    }
}
